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WATCH: The Democratic and Republican campaigns responded as the FBI said it had found no reason to bring criminal charges against Democratic candidate Hillary Clinton, after reviewing 650,000 emails, discovered in October, linked to her use of a private email server while secretary of state. (AP)

U.S. FBI Director James Comey has told the U.S. Congress that a recent review of newly discovered e-mails has not changed the FBI’s conclusion in July that no charges are warranted against Democratic presidential candidate Hillary Clinton for her use of a private e-mail server when she was the U.S. secretary of state.

A Republican U.S congressman, Jason Chaffetz, confirmed that Comey informed the House Oversight Committee about the agency's latest conclusion on November 6.

Clinton's Republican rival for the presidency, Donald Trump, told a campaign rally in Detroit that Clinton was being protected by "a rigged system."

"Hillary Clinton is guilty," he charged. "She knows it. The FBI knows. The people know it."

Comey wrote to Congress on October 28 about newly discovered e-mails linked to Clinton's use of a private e-mail server, adding turmoil to the presidential race less than two weeks before the November 8 vote.

In the days that followed, opinion polls showed Clinton losing much of her substantial lead over Trump.

His latest letter said the results of their study of the new messages found no reason to reverse an earlier ruling that Clinton did not break the law.

Brian Fallon, a spokesman for the Clinton campaign, wrote on the Twitter social-media site that "we're glad this issue is resolved but for the record, this could easily have been learned before [the] 1st letter was sent."

Trump has repeatedly criticized Clinton on the e-mail issue, telling his rallies that she should be prosecuted for mishandling classified information.

Republican Congressman Paul Ryan, who is the speaker of the House of Representatives, issued a statement on November 6 saying that, regardless of the FBI's conclusions, Clinton had endangered government secrets and national security.